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Date: Thu, 16 Nov 2023 11:14:10 -0800 From: Kees Cook <keescook@...omium.org> To: Sumit Semwal <sumit.semwal@...aro.org> Cc: Kees Cook <keescook@...omium.org>, Christian König <christian.koenig@....com>, Azeem Shaikh <azeemshaikh38@...il.com>, linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] dma-buf: Replace strlcpy() with strscpy() strlcpy() reads the entire source buffer first. This read may exceed the destination size limit. This is both inefficient and can lead to linear read overflows if a source string is not NUL-terminated[1]. Additionally, it returns the size of the source string, not the resulting size of the destination string. In an effort to remove strlcpy() completely[2], replace strlcpy() here with strscpy(). Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1] Link: https://github.com/KSPP/linux/issues/89 [2] Cc: Sumit Semwal <sumit.semwal@...aro.org> Cc: "Christian König" <christian.koenig@....com> Cc: Azeem Shaikh <azeemshaikh38@...il.com> Cc: linux-media@...r.kernel.org Cc: dri-devel@...ts.freedesktop.org Cc: linaro-mm-sig@...ts.linaro.org Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/dma-buf/dma-buf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 21916bba77d5..8fe5aa67b167 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -46,12 +46,12 @@ static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen) { struct dma_buf *dmabuf; char name[DMA_BUF_NAME_LEN]; - size_t ret = 0; + ssize_t ret = 0; dmabuf = dentry->d_fsdata; spin_lock(&dmabuf->name_lock); if (dmabuf->name) - ret = strlcpy(name, dmabuf->name, DMA_BUF_NAME_LEN); + ret = strscpy(name, dmabuf->name, sizeof(name)); spin_unlock(&dmabuf->name_lock); return dynamic_dname(buffer, buflen, "/%s:%s", -- 2.34.1
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